It's ok don't worry, the price of the upvote is related to the steem price, if it goes up it will increase, if it goes down it will decrease, so keep posting and don't worry about that, I also had today in the morning more than 15 dollars from this post and after less than 15 and it may go to 20 if sudenly the price go up tomorrow, keep posting and never give up, interuct with people and use my group if you want to grow faster, the most important there is to follow the rules, good luck. ☺